Manufacture of bilged metallic barrel-bodies.



QW E D 0 B L EL R R A B C SU. MA AH UM .MILD .WE G .H HB F o .E R U T..C A rr U N, A M

APPLICATJUN FILED )AN.22, 1915.

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wma/WM) Patented Mar. 19, 1918.

2 SHEETS-SHEET 2.

F I G E- H. WILLIAMS.

MANUFACIURE 0F BILGED METALLIC BARREL BODIES.

APPLICATION FILED IAN- 22. I,9I6.

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'lili den srerrns PATENT OFFICE.

IEBMN WELIIEAMS, 0F HOMSTEAE, PENNSYLVANIA,

MNUFACTRE GF ISLGEI'I METALL-BARREL-BODIES.

To all whom it may concern.

Be it known that l, HERMAN W'iLLIAMs, e citizen of the United States,resident of Homestead, in lthe county of ilieglieny end State ofPennsylvanie, have invented certain new and useful Improvements in the'Menufecture of Bilged Metallic BerreLBodies, of which the following isa specification.

This invention relates to the manufacture of hilged barrel bodies frommetal of suitable gage, and the primary object is to so displace themetal incident to forming the loilge es to distribute it uniformlythrougiim ont the oilged portion. ai l the one lrling or crimpingtendency eo. monly eX- perienced, particularly at or scent the marginalportions of the sheet. The new method herein involves e. manipulationwherein all portions of the sheet or plate are placed under tensionduring the forming opn eration, there being no opportunity for thecreation of Compression strains which are immediately responsible forthe appearance 0f crimps or laps in the bilged bodies.

It is further characteristic of the iin-'enm tion that in forming thehilge the metal is displaced in e direction transversely of the sheet,e., longitudinally of the barrel body, there being a relatively smellernennt of placement lengthwise oit' the sheet. By this means thestretching and oonseenent thinning of the metal: is distributed'oniforn'lly throughout. the sheet, with all portions therew of ofsubstantially uniform strength.

In the preferred practice, the fet plete is eurved to fit within. thelcurved marginal portion of bed or press, the leed inter-meu diete itsmarginal portions being depressed in conformity with the hilge to heimparted to the'plate. After tightly securing the margine of thepositioned plete so that there can be no slipping or bodily displacementin any direction', e. portion of the plate, preferably a part locatedintermediate its ends, 1s

pressed into the bilge-forming cavity of .the body by means of a formeror die element which conforms tol such depression. This result' isproduced primarily. by stretching the mete-l tiensversel of the plete,and the portion thus shape is securely held or clamped by the formingelement, thereby placing endmenteining all of the remainn1 der of theplate under tension. Such re- 'A maning portions are then'I pressed intofull conformity with the bed depression, and

with the metal Linder tension end with. no

Specification of Lettere Patent.

.application filed January 22, 3.316. Serial No, 73,705. i

opportunity for compression sti-eins to develop, the result is euniformly bilgen plate from which kinks or laps ere totally absent.rl`he hilg'ing operation which follows initial ressing of the blank ispreferably accomplished by the combined pressing end rolling action ofdie-like formele having faces shaped llconlplelnentary with the lleeddepres` sion, such forming opera-tion proceeding progressively from theinitially pressed ortion to the ends of the blank hy a. rol. ing orironingpot action which expands the sheet principally in the directionof its width or longitudinally of the length. of the borrel body,thereby eliminating such plate deformations as may result during theini-- tial pressing from placing the motel under tension, and completingthe bilging operetion. A

Apparatus for practising the invention is illustrated in theaccompanying drawings,

Figure l being n side elevation of a desireloleA adaptetion thereof.Fig. 2 is e vertical cross-section on line 2-2 of Fig. 1. Fig. 3 is asectional plan on line 3-3 of Fig. l.

e is a bottom' plan view of the die elements which cooperate with therecessed base of the press. Fig. 5 is e central vertical seew tion of'the press, tl e central die element losing shown depressed foraccomplishing the preliminary pressing of the plate, end and 'Yillustrate the blank at the comple tion of the preliminary pressingoperation. Fig. 8 is e view similar to Fig. 5 showing the die elementsfully expended as et the completion of the linge-forming operation,

and Figs. 9 andl-are detail views of the fully bilged blank. Fig. 11 isa View of the bilged blank after it has been vrolled 0r curled into bodyforno.

Referring to the drawings, 2 designates the bed or base portion 0f thepress, the top surface thereof formed with the downwardly `curveddepression, and this depression Within its marginal portions isdishednor recessed at 4 in conformity with the curva-- ture of the bilgeto be imparted to the plate or sheet A. This sheet is curved toit wlthindepression 3, with its marginal side portions a resting on the curvedmargins of depression 3, and with the ends b' ofthe blank.' bearingdownwardly on top of base 2 at opposite ends of depression 3. Ifdesired, bed 2 may be in the form of a magnet for retaining the plate inproper position preceding the securing of the plate margins.

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is depressed in conformity with the bilge to he imparted to the sheet,then immovably holding the longitudinal edges of the sheet andprogressively bilging the sheet from at or near its center outwardly tothe opposite ends thereof.

2. A method of producing bilged barrel bodies consisting in confining ametal sheet to prevent contraction thereof, and stretching the sheet inthe direction of its Width or longitudinally of the ultimate barrel bodywith such stretching proceeding progressively'throughout the length ofthe sheet.

3. A method of producing bilged barrel bodies consisting in confiningthe marginal portions of a metal sheet to prevent contraction, andstretching the sheet in direction longitudinally of the ultimate barrelbody.

with such stretching imparted initially to a portion of the sheet andproceeding progressively from such initial portion throughout the lengthof the sheet.

4. A method of producing bilged barrel bodies consisting in confiningthe marginal portions of a metal sheet to prevent contraction,subjecting a portion of .the sheet to bilge--forming pressure in adirection longitudinally of the ultimate barrelbody and thereby placingunder tension the-remainder of the sheet, vand bilging such remainder bypressure applied subsequently to said initial bilging.

5. A method of producing bilged barrel bodies consisting in conning themarginal portions of a metal sheet to prevent contraction, subjecting aportion of the sheet to bilge-forming pressure in .a directionlongitudinally of -the ultimate barrel body and thereby placing undertension a portion of the sheet between such bilged. portion and theconfined blank margins, and bilging the remainder of the sheet by aprogressive rolling action proceeding from said bilged portion to theextremity of the blank distant therefrom.

6. A method of producing bilged barrel bodies consisting in curving aflat sheet of metal in the direction of its length,-conlin ing thecurved sheet at all of its margins andthereby forestalling contraction,exerting bilge-forming pressure on a portion of the sheet in directionlongitudinally of the ultimate barrel body and thereby placing theremainder of the marginally held sheet under tension, and deforming suchremainder by a rolling bilge-forming pressure proceeding progressivelyfrom said initially bilged portion to the conned margin of the sheetdistant therefii'ttf.

8. A method of producing bilged barrel bodies consisting in placing asheet of metal on a form that is curved longitudinally of the sheet andbilged transversely thereof, confining the marginal portions of thesheet against contraction in anyj direction, placing a portion of thesheet located intermediate its ends under deforming pressure and therebyconforming said portion to the bilged form with such deformation placingthe portions of the sheet at opposite sides thereof under tension, andforcing such portions'under tension into engagement with the bilged formby pressure proceeding progressively .and in 'opposite directions fromsaid initially bilgedl portion to the conlined sheet ends.

9. The methodof producing bilged barrel bodies which consists insemi-cylindrically curving a metal sheet and formin thereon projectingend flanges, in placin t such curved sheet over a bilged form or 'e andholding its marginal edges against displacement, then forcing said sheetinto the die so as to initially bilge it at or near its mid positionbetween said flanges then bilging the remainder of the sheet from saidinitially bilged portion in a progressive mannerI to said end flanges.

In testimony whereof I aix my signature ELLA MGCONNELL.

jrpgressively `from said initially bilged portion to the margin of the

